2
SRSH IO&M
B51142-004
Installation
If the fan was delivered with the motor unmounted, refer to
Belt and Pulley Installation
, page 5.
Damper Installation
If your fan is supplied with dampers, follow the directions be
-
low. If your fan does not include dampers, proceed to
Belt and
Pulley Installation
, page 5.
1. Place the damper inside the curb or inside the duct work. Ensure
the damper will open freely for the correct direction of the airflow.
2. Secure to curb at the damper shelf.
3. Drill hole in the curb shelf for conduit needed for motor wiring.
4. Operate the dampers manually to ensure the blades move freely.
5. Install fan over curb while aligning the conduit location with the
conduit hole in the curb.
Wiring Installation
All wiring should be in accordance with local ordinances
and the National Electrical Code, NFPA 70. Ensure the power
supply (voltage, frequency, and current carrying capacity of
wires) is in accordance with the motor name-plate. Refer to
the
Wiring Diagrams
, page 3.
Leave enough slack in the wiring to allow for motor move
-
ment when adjusting belt tension. Some fractional motors
have to be removed in order to make the connection with the
terminal box at the end of the motor.
Follow the wiring diagram included with the dis-
connect switch and the wiring diagram provid-
ed with the motor. Correctly label the circuit on
the main power box and always identify a closed
switch to promote safety (i.e., red tape over a
closed switch).
1. Lift hood assembly which covers the motor.
2. For internal wiring, run the electrical wire and conduit
through the opening drilled in the damper shelf (refer to
Damper Installation), then through the wiring conduit in
the ventilator base to the motor compartment.
3. For external wiring pull the wires through and complete
the wiring. For further information. Refer to
Wiring Dia‑
grams
, page 3.
Final Installation Steps
1. Ensure fasteners and set screws, particularly fan mounting
and bearing fasteners are tightened according to the recom
-
mended torque shown in the table,
Recommended Torque
for Setscrews/Bolts
.
2. Inspect for correct amperage with an ammeter and correct
voltage with a voltmeter.
3. Ensure that all accessories are installed.
4. Test the fan to be sure the rotation is the same as indicated
by the arrow marked
Rotation
.
NOTICE! Do not allow the fan to run in the wrong
direction. This will overheat the motor and cause
serious damage. For 3-phase motors, if the fan is
running in the wrong direction, check the control
switch. It is possible to interchange two leads at
this location so that the fan is operating in the cor-
rect direction.
5.
Inspect wheel-to-inlet clearance. Wheels may shift in ship-
ment. To realign wheel-to-inlet, shift upper bearing so there
is an equal radial clearance between the wheel and inlet. Re
-
fer to
Wheel to Inlet Clearance
, page 6.
Operation
Pre-Start Checklist
1. Lock out all the primary and secondary power sources.
2. Inspect and tighten fasteners and setscrews, particu
-
larly fan mounting and bearing fasteners Refer to
Rec‑
ommended Torque
chart.
3. Inspect belt tension and pulley alignment. Refer to
Belt
and Pulley Installation
, page 5.
4. Inspect motor wiring. Refer to Wiring Installation.
5. Ensure belt touches only the pulleys.
6.
Rotate the wheel to ensure it rotates freely.
7. Ensure fan and duct work are clean and free of debris.
8.
Close and secure all access doors.
9.
Restore power to fan.
Start-up
Turn on the fan. In variable speed units, set the fan to its
lowest speed. Inspect for the following:
• Direction of rotation
• Excessive vibration
• Unusual noise
• Bearing noise
• Improper belt alignment or tension (listen for squealing)
• Improper motor amperage or voltage
NOTICE! If a problem is discovered, immediate-
ly shut the fan off. Lock out all electrical power
and check for the cause of the trouble. Refer to
Troubleshooting, page 5.
Inspection
Inspection of the fan should be conducted at the first
30
minute
,
8 hour
and
24 hour
intervals of satisfactory op
-
eration. During the inspections, stop the fan and inspect
as instructed.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts. Ad
-
just and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten
as necessary.
24 Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Recommended Torque for Setscrews/Bolts (IN-LB)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque
Size
Recommended
Torque
Min.
Max.
#8
5/64”
15
21
3/8”-16
324
#10
3/32”
27
33
1/2”-13
780
1/4
1/8”
70
80
5/8”-11
1440
5/16
5/32”
140
160
3/4”-10
2400
3/8
3/16”
250
290
7/8”-9
1920
7/16
7/32”
355
405
1”-8
2700
1/2
1/4”
560
640
1-1/8”-7
4200
5/8
5/16”
1120
1280
1-1/4”-7
6000
3/4
3/8”
1680
1920
-
-
7/8
1/2”
4200
4800
-
-
1
9/16”
5600
6400
-
-
